Instr Manual: E2M28 and E2M30 Rotary Vacuum Pumps - en
Instr Manual: E2M28 and E2M30 Rotary Vacuum Pumps - en
Instr Manual: E2M28 and E2M30 Rotary Vacuum Pumps - en
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<strong>E2M28</strong> <strong>and</strong> <strong>E2M30</strong> <strong>Rotary</strong> <strong>Vacuum</strong> <strong>Pumps</strong><br />
3.7.2 Check the direction of rotation<br />
PAGE<br />
20<br />
INSTALLATION<br />
CAUTION<br />
Ensure that the motor rotates in the correct direction. If it does not, the pump <strong>and</strong> your vacuum<br />
system can become pressurized wh<strong>en</strong> you operate the pump.<br />
1. With the pump inlet still unconnected, watch the motor cooling-fan through the motor fan-cover,<br />
switch-on the electrical supply to the motor for a few seconds, th<strong>en</strong> switch off the electrical supply<br />
again.<br />
2. Check that the motor cooling-fan rotates in the correct direction shown by the arrow on the<br />
motor mounting plate. If the direction of rotation is incorrect:<br />
• Switch off the electrical supply immediately.<br />
• Isolate the pump from the electrical supply.<br />
• Remove the terminal-box cover <strong>and</strong> swap wires L1 <strong>and</strong> L3: see Figures 8 <strong>and</strong> 9.<br />
• Refit the cover to the terminal-box.<br />
3.8 Connect the pump inlet<br />
Take note of the following information wh<strong>en</strong> you connect the pump to your vacuum system. Refer to<br />
Section 7.4 for details of the accessories m<strong>en</strong>tioned below.<br />
• For optimum pumping speeds, <strong>en</strong>sure that the pipeline connected to the inlet-port is as short as<br />
possible <strong>and</strong> has an internal diameter not less than the inlet-port diameter.<br />
• Support the vacuum pipelines to prev<strong>en</strong>t loading of the coupling-joints.<br />
• If necessary, incorporate flexible bellows in your system pipelines to reduce the transmission of<br />
vibration <strong>and</strong> to prev<strong>en</strong>t loading of coupling-joints. If you use flexible bellows, you must <strong>en</strong>sure that<br />
you use bellows which have a maximum pressure rating which is greater than the highest pressure<br />
that can be g<strong>en</strong>erated in your system. We recomm<strong>en</strong>d that you use BOC Edwards flexible bellows.<br />
• Use a suitable inlet catchpot if you pump cond<strong>en</strong>sable vapours or if you use the pump for very dusty<br />
applications.<br />
• Ensure that sealing surfaces are clean <strong>and</strong> scratch-free.<br />
Connect your vacuum system to the inlet-port (Figure 1, item 6). To make this connection, you can:<br />
• Connect to the NW25 flange supplied: use the NW25 c<strong>en</strong>tring-ring <strong>and</strong> 'O' ring supplied.<br />
• Remove the NW25 flange <strong>and</strong> connect to the 1 inch BSP threaded hole.<br />
• Use an NW25 to 28 mm bore tube adaptor available as an optional accessory, see Section 7.4.11.<br />
Issue K 20 Jul 05